Improvement in hot-aie furnaces



H.G.BURR.

Hot-Air Furngce.

No. 76.397. Patented April 7, 1868.

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".PErERS. FNOTu-LrrHoGRAPt-IER, WASHINGTON, D t:4

H. G. BURR, OF MINNEAPOLIS, MINNESOTA.

Letters Paten-t No. 76,397, dateeZAprz'Z 7, 1868.

IMPROVEMENT IN HOT-AIB. IURNAGES.

@te tlgthtlt teatro tt in ilpse stas patent mit omlaag part nf tigt stmt.

TO ALL WIIOM IT MAY CONCERN:

Be it known that I, H. Gr.' BURR, of Minneapolis, Hennepin county, Minnesota., have invented new and useful Improvements in Hot-Air Furnaces; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings,- forming part of thisspecitieationf. i

This invention relates to a new and improved method of constructing hot-air furnaces for warming buildings, and it consists inan arrangement of vertical dues and tubes, and horizontal plates, whereby the heat-radiating surface of the furnace is greatly increased.

Figure l represents a front sectional elevation of the furnace through the line c: a: ofg. 2.

Figure 2 is a horizontal-section through the line y g/ o-f Eg. l.

Figure 3 is a vertical section through the line .e e of tig. 2.

Similar letters of reference indicate corresponding parts.

A represents the rebox or furnaceproper, 'which is oval in form and surrounded by' vertical tubes and. ues. B represents the furnace-wall.

As represented in fig. l," this hot-air furnace is divided into four compartments, by four horizontal plates or partitions, marked C, D, E, and F, and the compartments are marked Gr, II, UT, and K. G is the hot-air chamber, I:I is the combustion-chamber, J is the air-heating chamber; and K encloses the ash-pit,.L, and into which thel products of combustion pass, through diving-ues, as will be described. l

Thei air enters the furnace from without, through apertures, m,'in the wall, below the tubes, and is discharged by the tubes into the hot-air chamber Gr, being heated on its passage upwards through the tubes.

The top of the Afire-box is open to the combustion-chamber II, and the products of combustion spread through this chamber, but, as seen in iig. Q, there are two vertical plates or p artitions, which divide this combustion-chamber into three compartments. These plates are marked n and o. a represents annular divingues, which surround many of the air-tubes, and through which the products of combustion pass from the chamber H tothe chamber K, and from thence upward through outside annular dues, marked a', back into the two outside compartments of vtheycombustion-chamher I-I. Y

The dues, which conduct the smolreand gases from the chamber II, pass u p through the hot-air chamber G. The apertures from which they start are seen in dotted linesin lig. 2, and'one of the ilues is also seen in figs. I and 3, marked cl. There are apertures through the dividing-plates n and o, which are closed .by slides, marked lo, but through which o. portion et' the productsv of combustion may pass when the slides nre'drawn haelt, and which might be desirable forthe purpose lof in creasingthe draught through the ire-box.

v rIhe ireboxlis protected by ire-briekwithin the chamberd, and the partition plates nrc made of cast iron or some equivalent material.

The walls of the furnace, B, may be constructed of masonry, P (seen in iig. 3) is a water-tube, which passes through the hot-air chamber, and is-perforated with holes through its upper side,4as seen. One end of this tube passes through the wall, to which end is attached a water-vessel marked s. VWater is poured linto this vessel, and passes through the tube, from which it is` evaporated; The vapor passes'oi through the holes in its upper side, and mingles with the air, thus' moistening it, and renderingv it fit for respiration. The hot air is discharged from the chamber Gr through the pipes f, seen on the top ofthe furnace.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1.- The arrangement and combination of the chambers G,-II,.I, and K, in a hot-air furnace, substantially as shown and described.

2. I claim the annular ues a and a', in combination with the chambers II and K, as and for the purposes set forth.

The above specification of my invention signed by m0 this 4th day ot' April, 1867.

' H. Gr. BURR.

Witnesses:

J. S. Bonn, S. I. Smm; 

